package com.itheima.edu.info.manager.controller;


import com.itheima.edu.info.manager.domain.Student;
import com.itheima.edu.info.manager.service.StudentService;

import java.util.Scanner;

public class StudentController {

    StudentService studentService = new StudentService();
    Scanner sc = new Scanner(System.in);

    public void start() {

        StudentLoop:
        while (true) {


            System.out.println("--------欢迎来到 <学生> 管理系统--------");
            System.out.println("请输入您的选择: 1.添加学生  2.删除学生  3.修改学生  4.查看学生  5.退出");
            int choice = sc.nextInt();

            switch (choice) {

                case 1:
                    //System.out.println("添加");
                    addStudent();
                    break;
                case 2:
                    //System.out.println("删除");
                    delStudent();
                    break;
                case 3:
                    //System.out.println("修改");
                    updateStudent();
                    break;
                case 4:
                    //System.out.println("查看");
                    getAllStudent();
                    break;
                case 5:
                    System.out.println("感谢您使用学生管理系统,再见!");
                    break StudentLoop;
                default:
                    System.out.println("您的输入有误,请重新输入:");
            }
        }
    }

    public void updateStudent() {

        Student[] stus = noStudents();
        if (stus == null) return;

        String id = existOrNot();
        Student stu = buildStudent(id);
        studentService.updateStudent(id, stu);
        System.out.println("修改成功");

    }

    public void delStudent() {

        Student[] stus = noStudents();
        if (stus == null) return;

        String id = existOrNot();
        studentService.delStudent(id);
        System.out.println("删除成功");

    }

    public void getAllStudent() {

        Student[] stus = noStudents();
        if (stus == null) return;

        System.out.println("学号\t\t姓名\t年龄\t生日");

        for (int i = 0; i < stus.length; i++) {
            if (stus[i] != null) {
                System.out.println(stus[i].getId() + "\t" + stus[i].getName() + "\t" + stus[i].getAge() + "\t\t" + stus[i].getBrithday());

            }
        }


    }

    private Student[] noStudents() {
        Student[] stus = studentService.getAllStudent();

        if (stus == null) {
            System.out.println("查无信息,请添加学生后重试");
            return null;
        }
        return stus;
    }

    private void addStudent() {


        String id;

        while (true) {

            System.out.println("请输入学号:");
            id = sc.next();

            boolean falg = studentService.isExist(id);
            if (falg) {
                System.out.println("学号已被占用,请重新输入:");
            } else {
                break;
            }

        }

        Student stu = buildStudent(id);

        Boolean result = studentService.addStudent(stu);

        if (result) {
            System.out.println("添加成功");
        } else {
            System.out.println("添加失败,学生id已满");
        }
    }

    public Student buildStudent(String id) {

        System.out.println("请输入姓名:");
        String name = sc.next();
        System.out.println("请输入年龄:");
        String age = sc.next();
        System.out.println("请输入生日:");
        String brithday = sc.next();

        Student stu = new Student(id, name, age, brithday);

        return stu;
    }

    public String existOrNot() {
        String id;
        while (true) {

            System.out.println("请输入学生id:");
            id = sc.next();
            boolean flag = studentService.isExist(id);

            if (!flag) {
                System.out.println("您输入的id不存在,请重新输入");
            } else {
                break;
            }
        }
        return id;
    }


}

